* {
    margin: 0px;
    padding: 0px;
  }
  li {
    list-style: none;
  }
  .box-right {
    left: 0px;
    position: absolute;
    top: 50%;
    margin-top: -20px;
    text-decoration: none;
    color: white;
    width: 20px;
    height: 40px;
    background-color: rgba(0, 0, 0, 0.3);
    line-height: 40px;
    text-align: center;
  }
  .box-left {
    position: absolute;
    right: 0px;
    top: 50%;
    margin-top: -20px;
    text-decoration: none;
    color: white;
    width: 20px;
    height: 40px;
    background-color: rgba(0, 0, 0, 0.3);
    line-height: 40px;
    text-align: center;
  }
  .box-button{
    display: none;
  }
  .box {
    position: relative;
    width: 721px;
    height: 455px;
    /* background: url(images/focus.jpg); */
    margin: 200px auto;
    overflow: hidden;
  }
  .circle {
    position: absolute;
    display: block;
    bottom: 10px;
    left: 50px;
  }
  .circle li {
    float: left;
    width: 8px;
    height: 8px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    margin: 0px 3px;
    cursor: pointer;
  }

  .box ul li{
    float: left;
  }
  .box ul{
    position: absolute;
    width: 600%;
  }
  .box-left:hover{
   background-color: rgba(0, 0, 0, 0.5);
   color: red;
  }
  .box-right:hover{
    background-color: rgba(0, 0, 0, 0.5);
    color: red;
   }
   .current{
    background-color: #fff;
   }